Media G2

ADI’s highly efficient, cost effective arsenic removal system consists of pressure vessels containing MEDIA G2®. Although MEDIA G2® water treatment system was developed for adsorbing arsenic, it will also remove iron, manganese, chromium, uranium and other dissolved metals.

ADI’s MEDIA G2® is a natural compound, not a synthetic compound. It is produced in North America and consists of granular, calcined diatomite upon which ferric (iron) hydroxide is chemically bonded. Iron attracts the arsenic in water and binds it to the media by chemisorption.

MEDIA G2® arsenic filtration systems work well in the pH range of 5.5 to 7.5, and unlike many other adsorbents, it is not affected by high concentrations of sulfate, chloride, iron or silica.

The ADI arsenic removal system operates in a down-flow mode, typically providing 5 - 10 minutes residence time. As the media in the filters becomes saturated with arsenic, the concentration in the treated water begins to increase. Before this concentration reaches the maximum allowable contaminant level (break through), the media is either replaced or regenerated in-situ.

Unlike other iron-based adsorbents, MEDIA G2® adsorption media can be regenerated 4 to 5 times, in a process which takes only a few hours. The volume of waste produced in regeneration is typically less than 0.1% of the volume of treated water. Of significance is the fact that the residuals generated from regeneration, as well as the spent media itself, are non-hazardous according to USA EPA’s TCLP test.

MEDIA G2® was the first adsorbent of its type to be certified by NSF International to Standard 61. It also complies with FDA regulations, and has been performance-verified by ETV US & Canada.

• First with NSF listing
• First plant in US
• First plant in Michigan
• First with ETV
• Most data available

Media G2^® Technology.
The first of its kind to be certified to ANSI/NSF-61 for drinking water applications.

Installations

ADI’s MEDIA G2® has been used worldwide since 1998.

Institutional
The first installation in the United States occurred in early 1999 with the retrofit of an existing activated carbon filtration plant at Rose Hill Center, a small health care facility in Michigan. The plant consists of six 36" diameter filters; retrofit included replacement of the activated carbon with MEDIA G2^® and installation of an automated pH control system to maintain filter inlet pH at 6.5. The plant has been monitored by the USEPA since start-up, and continues to reduce arsenic from 30 ppb to <3 ppb.

Commercial
Two arsenic removal systems were installed at a bottled water facility in California in 1999. Each system consists of two 8' diameter stainless steel filter vessels operating in parallel, and treats 250 gpm, reducing arsenic from 10 ppb to 2 ppb. Since the filters do not alter the chemistry of the water, except removing arsenic, the water is able to maintain the important “natural spring water” designation.

Municipal
The first international use of this technology occurred in March, 1999 with the installation of a 100gpm plant in New Zealand. Arsenic at this location averages 26 ppb. A plant consisting of two 5' diameter vessels was installed outdoors on a concrete slab. It operates unattended, except for backwashing every 2 - 3 months. Outlet arsenic is <5 ppb.

Small municipal plant in Michigan

The media's surface coating is specifically adapted to arsenic adsorption, while remaining virtually oblivious to substances such as chlorides and sulfates which interfere with other technologies. The process does not change the general chemistry of the water; in fact it has even been used in the bottled spring water industry, where maintenance of natural water chemistry is critical. It was also the first process media of its type to be certified to ANSI/NSF Standard 61 for drinking water applications.

With over 200 engineers and scientists involved in innovative treatment around the world, ADI has the experience and expertise to handle all aspects of any size project, from 5 gpm commercial units to municipal/industrial treatment plants of up to 10,000 gpm.

There are now over 15 plants installed worldwide, all reducing arsenic to less
than 5 ppb

Sampling of results.